add search feature specs
cleanup default search form
use path helpers from kuhsaft engine

fixes routing errors when included form in non-kuhsaft pages
implement controller specs for pages#index (search)
use page#link to render absolute page url
rearrange order of search form fields
Merge branch 'features/search' into releases/v1.5.0

Conflicts:
	spec/controllers/kuhsaft/pages_controller_spec.rb